shmj 0 Report post Posted May 30, 2012 got a silly question here....I see the ceiling fans have different no. of blades (2, 3, 5, 6), etc... Is it cos more no. of blades = more wind/ cooler?Thanks! Share this post Link to post Share on other sites
yrfren 0 Report post Posted July 5, 2012 got a silly question here....I see the ceiling fans have different no. of blades (2, 3, 5, 6), etc... Is it cos more no. of blades = more wind/ cooler?Thanks!I was wondering about this question too as I am eyeing a fan from Amasco with 2 blades. Looks quite cool. Any comments/reviews about this brand?http://www.amasco.com.sg/product.aspx?pID=202Then I came across this article about the number of blades.VIII. How many blades is best?These days ceiling fans are available with any number of blades from one to eight, although any number below 3 and above 6 is for novelty or decorative purposes only. Most fans have 4 or 5 blades, some are adaptable to take either.Most people assume that more blades move more air, i.e. a fan with five blades moves more air than a fan with four blades. This, in fact, is incorrect. More blades results in a greater load on the motor, and a greater load on the motor causes it to operate at a slower speed. A fan with less blades operating at a faster speed will more more air than a fan with more blades operating at a slower speed. This is why most commercial fans have three blades and a high speed motor, to provide the greatest amount of airflow efficiently.However, one thing about commercial fans is, noise is less of a factor than in residential situations. A 3 blade fan operating at a high speed is often quite noisy-- not a buzz or hum, but the helicopter noise of air moving. The greater number of blades and the slower the speed, the less noisy a fan will be. This is why residential fans (especially smaller models that operate at higher speeds overall) offer as many as 6 blades. Usually the additional noise of a four blade fan versus a five blade fan is not noticeable, but it can depend on the fan size and the motor speed.This comparison assumes similar fans with similar motors. Obviously a 4 blade fan with a small, inexpensive motor will move less air than a 5 blade fan with a larger, more powerful motor, and probably be noisier as well. Share this post Link to post Share on other sites
